ln3-√2
    75.4-58-（75.4-65）+5
    25+36-2*5*6*2√6/5＝
    1/2+1/3+1/4-1/5
    20*（lg50-lg10）+（lg10-lg5）*40
    [120000-（80000-15000）]×（1-25%）+15000
     [120000-（80000-15000）]×（1-25%）+15000
    [120000-（80000-15000）]×（1-25%）+15000×25%
    （120000-80000）×（1-25%）+15000×25%
    （120000-80000）×（1-25%）+15000（120000-80000）×（1-25%）+15000×25%
    （120000-80000）×（1-25%）+15000
    8.92/99.3
    4.43%+（4.8%+4.66%+4.52%+5.65%-3.97%-3.75%-3.48%-4.43%）/4
    2.5*1.15/1.28+2.5*1.15*1.15/1.28^2+2.5*1.15*1.15*1.02/26%/1.28^2
    2.5*1.15/1.28+2.5*1.15*1.15/1.28^2+2.5*1.15*1.15*1.02/13%/1.28^2
    5*1.1/1.24+5*1.1*1.1/1.24^2+5*1.1*1.1/24%/1.24^2
    5*1.1/1.24+5*1.1*1.1/1.24^2+5/24%/1.24^2
    5*1.1/1.24+5*1.1*1.1/1.24^2+5/24%
    2*1.18/1.08+2*1.18*1.15/1.08^2+2*1.18*1.15*1.1/8%/1.08^2
    sin17

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